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gh-115637 clarify that time.perf_counter cannot go backwards #115638

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gh-115637 clarify that time.perf_counter cannot go backwards #115638

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3 changes: 2 additions & 1 deletion Doc/library/time.rst
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Expand Up @@ -314,7 +314,8 @@ Functions
clock with the highest available resolution to measure a short duration. It
does include time elapsed during sleep and is system-wide. The reference
point of the returned value is undefined, so that only the difference between
the results of two calls is valid.
the results of two calls is valid. This counter, like :func:`monotonic`, cannot
go backwards.

Use :func:`perf_counter_ns` to avoid the precision loss caused by the
:class:`float` type.
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